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Also the random chemical reactions scenario explains the concurrent evolution of human in all five continents ... There are no starting points in random reactions. Changing a gene causes only minor changes in the organism and replacing a missing gene doesn’t make everything alright. All ...

"Some species, such as some snails, practice sex change: adults start out male, then become female (See also sex reversal). In ... they end up on the bare sea floor. This is triggered by the presence of a chemical produced by the females, bonellin. Some species, however, have no sex-determination ...

... gas from water and use the water's hydrogen in making sugars. Chemicals change state as they react all the time. TNT is a solid that makes a lot ... such as water in solid, liquid or gaseous state. The product of a chemical reaction has a new composition and can have many different physical ...

... after n divisions. I read some articles (on Biology Stack Exchange and Wikipedia) on cellular differentiation and embryogenesis but still ... differentiation after a given amount of divisions ⋅ or a chemical substance (either cell-borne or external) forces a change in the ...